How to dress a Rthro Rig?

I imported a Rthro Rig into my game using the Rig Builder.
I can’t figure out how to dress it with custom clothing.

To the right you can see the full body suit that I want to apply to the Rig on the left.
This is the structure of the Suit:

When I just parent the accessory to him he suddenly gains 40kg of body fat.

I want it to wrap around the body and dress him up like you would expect it to look like.
Can anybody help me?

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Nope you can’t.
Cage mesh is broken for that rthro character likely.